my computer doesn't boot and produce a kind of continuous beep

[heureuchin]

My computer doesn't boot. The fans are ok. I can hear a beep and see a light on the mother board. No signal on the screen. What can I do ? What's wrong ?
Thanks for your help.

 

[C12Friedman]

I'll recommend you start here http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems